<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        ul {
            width: 200px;
            height: 200px;
            background-color: lime;
            display: flex;
            align-items: flex-start;
            justify-content: space-between;

        }

        li {
            list-style: none;
            background-color: black;
            border-radius: 50%;
            width: 20px;
            height: 20px;
            margin: 5px;
            box-shadow: 2px 2px 2px #666666;
        }

        li:nth-child(2) {
            align-self: center;
        }

        li:nth-child(3) {
            align-self: flex-end;
        }
    </style>
</head>

<body>
    <ul>
        <li></li>
        <li></li>
        <li></li>
    </ul>
</body>

</html>